I think 5" is where you are headed.
North Group ED127 if the budget is tight, Tak TSA120 if it will stretch.
The NG ED127 is a well respected scope, with many followers here. It would also allow a similar 80mm scope if wider than the current 5" FOV was desired.
Don't forget to factor in field flatteners and reducer/flatteners in too, they are essential in some/most scopes.
Gary
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